ORCHARD SPRAYING EXPERIMENTS II. 3I 



C. — Dilution of Lime-Sulphur Concentrated Solutions. 



Although fairly well understood, it is advisable to emphasize 

 the fact that concentrated lime-sulphur sprays, commercial or 

 home made, cannot be used with success by guess-work dilu- 

 tions. The density of the concentrate must be determined by 

 a hydrometer and the dilutions made according to the reading 

 'Of the instrument and the- dilution table. 



Since the publication of 'the dilution tables in the bulletins of 

 this Station in recent jears, additional work has been done 

 ■elsewhere relating to the chemistry of the lime-sulphur com- 

 pounds and the most economical and effective dilutions to use. 



The table * on p. 32 is recommended. The figures in paren- 

 theses are the number of gallons for the respective densities, 

 determined to the hundredth part of a gallon. The numbers in 

 heavier type are the practical amounts to use. 



In practice, then, the first step is to determine the density 

 with the hydrometer. Knowing the density, the table shov/s 

 the amount necessary per 50 gallons of spray. ' Next, find the 

 weight of a gallon of concentrate; then figure out the weight 

 of the respective fraction shown in the table. The height of 

 this latter amount of liquid can then be marked on a measuri'-'g 

 stick. This, of course, need be done only, once for each stock 

 of concentrate. 



For example, with a stock solution reading 31° Beaume, 

 having made a measuring stick showing the height in the meas- 

 ure of 2-5 of a gallon, it is only necessary for summer spraying 

 to pour I 2-5 gallons of the concentrate into a mixing barrel or 

 barrel pump of 50 gallons capacity, fill with water and stir. 

 Greater amounts are of course made in proportion. 



Do not add arsenate of lead in any case until ready to apply 

 the spray. It should be thoroughly stirred into the solution. 

 2 or 3 pounds to 50 gallons is considered sufficient. It should 

 be thoroughly mixed with a few gallons of the water that go to 

 make the total volume of spray so that it may be in a finely 

 divided state and pass readily through the sieve. 



* Based on Table XI, Bui. 329, N. Y. (Geneva) Agr. Exp. Sta. 



